php - 如何使用 PHP 动态插入 CSS 类？

Question

下面的代码有什么问题？我想在相应的 <li> 时动态插入“当前”CSS 类元素被点击。谢谢!

<?php 
$pg = $_SERVER['PHP_SELF']; 
?>

<section>
    <aside>       
        <nav>
            <ul>
                <li class="<?php if($pg == 'index.php?page=about.php'){echo 'current';} ?>"><a href="index.php?page=about.php">About</a></li>                       
            <li class=""><a href="">Services</a></li> 
            </ul>
        </nav>
    </aside>
<section>

Answer 1

尝试:

<?php 
$pg = $_GET['page'];

$allow = array('about.php', 'main.php', 'other.php');
if ( !in_array($pg, $allow) ) {
    $pg = 'default_value';
}
?>

<section>
    <aside>       
        <nav>
            <ul>
                <li class="<?php if($pg == 'about.php'){echo 'current';} ?>"><a href="index.php?page=about.php">About</a></li>                       
            <li class=""><a href="">Services</a></li> 
            </ul>
        </nav>
    </aside>
<section>